Gaseous-fuel pump for internal-combustion engines



Aug. 1927. 1,638,289

E. R. BURTNETT GASEOUS FUEL PUMP FOR INTERNAL COMBUSTION ENGINES I FiledSept. 18, 1924 IIIIIIIIIIIIIII/IIIIA 4 "NIH IIIII of I um Patented Aug.9, 1927.

emits!) STATES RATE T IC EVERETT R. BURTNETT, OF LOS ANGELES,CALIFORNIA, ASSIGNOR, BY'DIRECT AND MESNE ASSIGNMENTS, TO THE AUTOMOTIVEVALVES 00., OF LOS ANGELES, CALI- FORNIA, A VOLUNTARY TRUST.

GASEOUS-FUEL PUMP FOR INTERNAL-COMBUSTION ENGINES.

Application filed September 18, 1924. Serial No. 738,418.

My invention relates to gaseous fuel pumps for internal combustionengines of the particular type disclosed in my co-pending applicationfor patent filed November 22, 1923, Serial No. 676,280, theprincipalobject of my invention being to provide an internal combustion enginehaving a precompression" port for the separately formed piston valvecylinder and further to form in said head-a recess that serves as acombined head and support for the piston valve cylinder and, further toform in said head a'recess that serves as a connection and'commonclearance chamber for the chambers within the pumping and piston valvecylinders and said head, also being provided with an unrestricted outletopening for the gaseous fuel that is compressed within said pumpingcylinder.

With the foregoing and other objects in view, my invention consists incertain novel features of construction and arrangement of parts thatwill hereinafter be more fully described and claimed and illustrated inthe accompanying drawings in which:

Fig. 1 is a vertical section taken through the center of an internalcombustion engine embodying my improvements.

Fig. 2 is a horizontal section taken approximately on the line 22 ofFig. 1.

Fig. 3 is a top plan view of a-portion of an engine of my improvedconstruction.

Fig. 4-. is a vertical section taken approximately on the line 4-4: ofFig. 1.

Referring by numerals to the accompanying drawings, 10 designates acylinder block having a pair of pumping or pre-compres sion cylinders11, and two or more combustion cylinders 12.

Ordinary pistons such as 13 are arranged for operation within thevarious cylinders and all of said pistons are'connected in the usualmanner by connecting rods such as 14, to a crank shaft 15, a separatelyformed head block 16 is secured in any su'itable manner to the upper endof thecylinder block 10 and closes all of the chambers therein andformed integral with the side of said head block, I

directlyopposite to the pumping cylinders 11 is a lateral extension 17.

' The under face of this lateral extension machined-or finished at thesame time the under face of head block 16 is machined or finished andsecured in any suitable manner to the under face of said extension arethe upper ends of depending piston valve cylinders 18. I

The axes of these valve cylinders are in transverse alignment with theaxes of the respective pumping cylinders 11 and formed in the undersides of the block 16 and its lateral extension 17 are transverselydisposed pockets or recesses 19 that connect the chambers of the pumpingcylinders with the 1e. spective piston valve chambers and consequentlyforming common-clearance and compression chambers.

Formed through the side of head block 16 and leading from'each pumpingchamber, a free unrestricted outlet duct 20 and lead-' ing from eachduct outwardly and downwardly to the intermediate portion of theadjacent combustion cylinder is a compressed gaseous fuel transfer duct21. v I

Block 16 and lateral extension 17 are formed with cooling fluidcirculation chambers Athat entirely overlie the chamber 19 outlet duct20.

Formed through the walls of the piston valve cylinders 18 are gaseousfuel inlet ports 22 and arranged for operation within each of saidcylinders is a piston valve 23.

These piston valves are connected by suitable connecting rods 24 to acrank shaft 25 that is arranged for rotation in suitable bearings in ahousing 26 and which latter is disposed at the lower ends of thecylinders Crank shaft 25 is driven by suitable means, at the same speedas crank shaft 15.

vWhile the engine that is provided with my improvements is in operation,the piston valve 23 moves downward to uncover and open the ports 22 asthe corresponding pumping piston moves downward in its chamber and as aresult-a charge of gaseous fuel is drawn downward in its chamber and,

as a result a charge of gaseous fuel is drawn int-ojthe piston valvechambenthe common clearance chamber 19 and the chamber of the pumpingcylinder.

As the pumping piston passes low center the corresponding valve movesupward into position to close inlet ports 22 and on the upward stroke ofthe pumping piston, the gaseous fuel charge is compressed and forcedthrough the corresponding transfer duct 21,, when the inlet ports of thecorrc spending; combustion cylinder are open.

Thus it will be seen that I have provided, in a two stroke internalcombustion engine, a relatively simple, practical and efficientarrangement of parts that includes a main pumping or precompressioncylinder, a separately formed gaseous fuel inletvalve cylinder, aseparately formed head for said pumping: cylinder, said head having aneX tension that serves as a head for the valve cylinder and which headis provided with a clearance chamber that is common to the piston valvechamber and, the chamber within the pumping cylinder and. also beingprovided with an unrestricted outlet from the chamber within the mainpumping cylinder.

Minor changes in the size, form and construction of the various parts ofmy improved internal combustion may be made and substituted for thoseherein described without departing from the spirit of the invention, thescope of which is set forth in the appended claims.

I c aim as my invention:

1,. In a pump for internal combustion engines, a separately formedgaseorv: fuel pumping cylinder, a gaseous fuel inlet valve cylinder, aseparately formed head for said. cylinders, said head being providedwith a recess that forms a common clearance chamher for the chamberswithin said pumping and valve cylinders and said head being providedwith an unrestricted outlet duct that leads from the chamber within saidpumping cylinder.

2.111 a pump for internal combustion engines, a separately formedgaseous fuel pumping cylinder, a gaseous fuel inlet valve cylinder, aseparately formed head for said cylinders, said head being pro videdwith a recess that forms a common clearance chamber for the chamberswithin said pumping; and valve cylinders, said head being provided withan unrestricted outlet duct that leads from the chamber within sa dpumpingcylinder. said valve cylinder being provided with a gaseous fuelinlet iorf; and a piston valve arranged for operation within said valvecylinder for controlling said inlet port.

engines. it separately formed gaseous fuel pumping cylinder, a gaseousfuel inlet valve cylinder, at separately formed head for said cylinders,said head being provided with a which piston valve cylindenx. ln a pumpfor internal combustion recess that forms a common clearance chamher forthe chambers Within said pumping and valve cylinders, said head beingprovided with an unrestricted outlet duct that leads from the chamberwithin said pumping cylinder, said valve cylinder being provided with agaseous fuel inlet port, a piston valve arranged for operation withinsaid valve cylinder for controlling said inlet port and a piston arangedfor operation within said pumping cylinder.

l. In a pump for internal combustion engines, a separately formedgaseous fuel pumping cylinder, a separately formed head therefor, agaseous fuel inlet valve cylinder, said head having an integral lateralextension that serves as a head for said valve cylinder, said head andextension having a recess that provides a common clearance chamber forthe chambers within the pump ing cylinder and valve cylinder and saidhead being; provided with an unrestricted outlet for the gaseous fuelthat is compressed within the pumping cylinder.

5. In a pump for internal combustion engines, a separatelyformed gaseousfuel pumping cylinder, a separately foru'ied head therefor. a gaseousfue inlet valve cylint er, said head havinga lateral extension thatserves as a head for said valve cylinder, said head and extension havinga recess that pro vides a common clearance chamber for the chamberswithin the pumping cylinder and valve cylinder, said head being providedwith an unrestricted outlet for the gaseous fuel that is compressedwithin the pumping cylinder, said valve cylinder being provided withaninlet port and a piston valve arranged within said valve cylinder forcontrolling said port.

6. In a pump for internal combustion engines. a pair of pumpingcylinders, a separately formed cylinder head closing the head ends ofsaid pumping cylinders, said head having a lateral extension withinwhich are formed laterally disposed ducts that lead from the chamberswithin the pumping cyL inders and open outwardy on the 'und face of thelateral extension of the head, the underface of the lateral evtension'oithe head lying in the same plane with and being a continuation oftheunder surface of the main body portion of the head. separately formedpiston valve cylinders secured to and depending from the nnderface ofsaid lateral cvtcnsion and the chambers within communicate respectivelywith the open outer ends of the laterally disposed ducts in saidseparately formed head. r

In testimony whereof I aflix my signature.

EVERETT R. BURTNETTY

